Safety nut lock



Patented Jaa.l 21, i930 UNITED STATES PATENT LOFFICE PAUL KAISLER, F BERLIN. GERMANY SAFETY NUT LOCK This invention relates to improvements in nut locks, the object of the-invention .being to provide improved mitA locking devices@ which are simple'and cheap i`n construction which may be readily installed in a nut, which require only the provision of a .channel in the nutfor the installationof the nut locking devices and by means of which a nut may be ,securely locked 'a ainst reverse movement after ithas been ti tened on a bolt and which also permits of t e unscrewing of the nut Without destruction of or injury to the nut lockin devices when this is desired.

Wit the above and other objects in view, vthe invention consists 4:in-the construction, combination and arrangement of devices hereinafter described and claimed.

I n the accompanying drawings Figure 1 is a plan of a nut and bolt provided vvith -nuty locking devices constructed and arranged in accordance vvith this invenl tion. l

Figure 2 is a section perpendicular to the line A-B ofthe lFigure 3. l

1 Figure 3 is a side view of the casing.

Figure 4e isaperspective sight of the'casing.

Parallel to the axle of the nut 1 there is a channel or ecess 3 `which is open against the bolt 2 and forms Walls 4, 5, and 6 Which ai) ball 12 is arranged in a casing 7 which is so constructed. as to lit exactly into the channel 3. The ball 12 is movable transversely of ythe casing andin a transverse slot 8 with bolt thread is provided.` In tlie end walls 9 of the casing are openings 10 for the reception of a'needle or the like by means of which Jthe ball may be manually moved out of engagement with the thread in order to permit the nutto be unscrewed.

A spring 1'1 lpresses the ball toward one end of the slot 8. If the nut'isturnd in the reverse direction to that indicated by the arrow, the ball is moved into the radially narrowed portion ofthe channel and lhence is caused to exert such a ressure upon the 4 thread of the bolt that urther turning in such direction is impossible. But if the nut is turned in the. direction indicated by the are parallel to the outer side of the nut. The i which the wall of the casing presented to 'the j 241,198, and in Germany December 20, 1926.

arrow the ball is caused to move, against the pressure of the spring, out of engagement Withthe' bolt thread and hence the nut may be loosened on thebolt or removed therefrom, as maybe desired. But in order to turn the nut l in the direction required to release dit from the bolt a needle 13 or the yiike must lirstbe introduced through one of the openings 10 in the ends of the casing and manipulated so as to move the ball from engagement e0 with the thread of the bolt as will be understood. f

The o` eration of my improved nut locking devic is positive and the same eifectually 'prevents reverse turning of the nut. Having 110W particularly ascertained and described the nature of my, invention and in yvvhat manner it is to be performed I declare that what I claim is: a

In a nut lock, a nut having a recess open To on the threads thereof, a casinor 1n said recess open on the side away from the threads and having a Yside adjacent the threads provided With a transverse slot and having Walls provided with openings for thereception of a needle' or the like, a ball in said casing engaging in and guided and restrained by the slot at the-.outer side -of said casing and adapted to engage the threads of'a bolt on Which the nut is screwed, and a spring active to press 8o the ball into threadl engagingposition, said spring extending diagonally lengthwise, in the casing and having its ends secured to one endof the casing.- In testimony whereof I a-X my si nature. NPAUL KAIS ER. 

